Automatic Save Function? (NOT for autorecovery)

Agreed, however there is a Bridge script though, that pops up a message reminding the user to save. I’ll dig it up...

EDIT:

Here's the link – Reminder to save?

P.S. Presuming that you have manually saved the file at least once, here is a minor addition to the original code to auto save the active document:

#target bridge; 
if( BridgeTalk.appName == "bridge" ) {   
var psRem= new MenuElement( "command", "PS Auto Save", "at the end of Tools"); 
} 
psRem.onSelect = function () {  
var mins =  60000 * 3; // Three minutes 
psReminder = function(){ 
    var bt = new BridgeTalk(); 
    bt.target = "photoshop"; 
    bt.body = "if(documents.length) app.activeDocument.save() alert('File auto-saved via running Bridge script');";  
    bt.send(4) 
    } 
id = app.scheduleTask( "psReminder()", mins, true );  
var win = new Window("palette","Photoshop Reminder"); 
win.bu1 = win.add("button",undefined,"Stop Reminder"); 
win.bu1.onClick = function(){ 
    win.close(0); 
    app.cancelTask (id); 
    } 
win.show(); 
};